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//Title of this code
//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_45

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static final int ASCII_0 = 48;
    public static String getNumberString(String s)
    {
      int counter = 0;
      for(int i = 0; i<s.length(); i++)
      {
        char g = Character.toLowerCase(s.charAt(i));
        if(g =='a' || g =='e' || g =='i' || g =='o' || g =='u') 
        {
            StringBuilder sb = new StringBuilder(s);
            sb.setCharAt(i, (char) (counter + ASCII_0));
            s = sb.toString();
            counter = (counter + 1) % 10;
        }
      }   
      return s;
    }
    
    public static void main(String args[])
    {
        System.out.println( getNumberString("abcdef") );
        System.out.println( getNumberString("hhhhhhh") );
        System.out.println( getNumberString("aaaaaaa") );      
        System.out.println( getNumberString("catpigdatrathogbogfrogmoosegeese") );
        System.out.println( getNumberString("hhhhhhh1234356HHHHDH") );
        System.out.println( getNumberString("AEIOUaeiou87878alkjdaslwlejrlajflawjkflwj") );
        System.out.println( getNumberString("") );
        System.out.println( getNumberString("x") );
        System.out.println( getNumberString("e") );
    }
}

[ + ] Show input
Compilation time: 1.23 sec, absolute running time: 0.32 sec, cpu time: 0.15 sec, memory peak: 29 Mb, absolute service time: 1.56 sec